Can anyone help with this sudoku please? I'm stuck at this point. I tried solver websites. They do find one unique solution, but can't tell which next logic step leads to solving the puzzle. The last step I was able to make was an XYZ elimination of a 2 in the indicated cell. Can anyone help me finding that one next logic step please? Best regards, Scott.

Someone clever than me will no doubt come up with better logic but the 2s form a chain. If the cell in row 2 column 3 (R2C3) was a 2, then following this through to R6C3, R6C7 and then R2C8, there would be two 2s in row 2 - therefore R2C3 cannot be a 2.

To see what is really going on, try and see what's going on with the pairs in column 2 and row 6 - this is an example of a technique known as "colouring". It's quite nice that you can do this with two numbers (i.e. 2's and 4's) on this occasion!

The 1rst trick I saw on this one was to use uniqueness technique on the 3 bottom regions. You have to place the 8 in R9C8, otherwise you'll have a big loop with digits 2, 4, 6 and 9 (in columns 1, 2, 6, 8) that would have 2 solutions.